Are you connecting via the network name, or directly by the network IP?
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Kyle CroninMar 19 '12 at 13:31

How do you connect to your NAS ? Wifi ?? Ethernet Cable (through router or hub) ?? How do the other devices connect to it? After what time does it time out ? Are you just trying to find or look for files or are you trying to work with them ? There could be many factors why it would have a slow speed. Do you use SMB or AFP ??? What version of OS X do you have installed ?
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1amtoo1337Mar 19 '12 at 16:43

@shitake83 The Macbook is connected wi-fi through a hub connected in a router. I wondered if it could be something with the wireless but I can connect from my iPhone without problems... Times out after approx. 1 min.. Just find them... SMB, but I tried with AFP as well. OS X 10.7.3
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DanielMar 19 '12 at 20:36

Not sure how or why but it suddenly started to work fine tonight... I'll keep looking to see if something happens. Thanks!
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DanielMar 19 '12 at 20:36